Missing face texture
You didn't include the textures, so I can't make a final judgement, however:
your character uses 2 materials for the body, 9 for the eyes and 5 for the mouth. I am guessing this is supposed to produce facial expressions cartoon-style by switching the materials. I would strongly suggest to take all the different face meshes and split them into several objects, so you can easily hide the ones you don't need. Also the normals of those exchangeable parts are flipped, I don't think that was intentional.
With this setup (and I don't think this is the way you want to approach this in Blender) you're multiplying with an alpha value. Specifically with that of the animalboyaeye_alb.5.png, that image, or at least its alpha channel seems to be wrong, but I can't judge, because the textures aren't there.
Try separating the face parts, it might already make the problem go away. If not, send us the .blend with the textures.